Equivalent & Substitute Parts for Littelfuse 0255002.M

Part Overview

The Littelfuse 0255002.M is a 2A 125VAC/VDC axial board mount fuse from the PICO® 255 series. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part maintains a through-hole axial configuration with fast-blow response characteristics suitable for circuit protection applications requiring 2A current limiting at 125V AC or DC.

Substiute Parts

0255002.M

Littelfuse Inc.In Stock: 11140255002.M Datasheet

Current PartRFQ

0251002.MRT1L

Littelfuse Inc.In Stock: 153980251002.MRT1L Datasheet

MFR RecommendedRFQ

0251002.MXL

Littelfuse Inc.In Stock: 62880251002.MXL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 0255002.M is based on electrical and mechanical parameter equivalence. The substitute parts must maintain identical current rating (2A), voltage ratings (125VAC/125VDC), response time (Fast Blow), mounting configuration (Through Hole Axial), and breaking capacity specifications. Both substitute parts—0251002.MRT1L and 0251002.MXL—are from the PICO® II 251 series and satisfy these core electrical requirements. The primary distinction between substitutes is packaging format: 0251002.MRT1L is supplied in Cut Tape (CT) format, while 0251002.MXL is supplied in Bulk format. Both substitutes are active products with enhanced compliance certifications compared to the obsolete main part.

Parameter Comparison

Engineering Selection Recommendations

Both 0251002.MRT1L and 0251002.MXL are electrically and mechanically equivalent to the 0255002.M. The substitutes are active products from Littelfuse's current PICO® II 251 series, providing improved regulatory compliance with ROHS3 certification and expanded approval agency certifications (CCC, CSA, cURus, PSE, TUV) compared to the obsolete main part. Selection between the two substitutes depends on procurement and assembly requirements: 0251002.MRT1L in Cut Tape format supports automated pick-and-place assembly, while 0251002.MXL in Bulk format accommodates manual assembly or alternative handling processes. Both substitutes maintain identical electrical performance characteristics including 2A current rating, 125V AC/DC voltage ratings, fast-blow response, and 50A AC / 300A DC breaking capacity.

Frequently Asked Questions (FAQ)

Q: Can 0251002.MRT1L and 0251002.MXL be used interchangeably with 0255002.M?

A: Yes. Both substitutes maintain identical electrical ratings (2A, 125VAC/VDC), response time (Fast Blow), mounting configuration (Through Hole Axial), and breaking capacity (50A AC, 300A DC). The primary difference is packaging format: Cut Tape versus Bulk.

Q: What is the physical dimension difference between the main part and substitutes?

A: The 0255002.M has a diameter of 0.095" (2.41mm), while both substitutes (0251002.MRT1L and 0251002.MXL) have a diameter of 0.110" (2.80mm). Both maintain the same length of 0.280" (7.11mm). This dimensional change must be verified for PCB footprint compatibility.

Q: Why are the substitute parts from the PICO® II 251 series instead of PICO® 255?

A: The PICO® II 251 series represents Littelfuse's current generation technology for this fuse category. The PICO® 255 series is obsolete. The PICO® II 251 substitutes provide equivalent electrical performance with enhanced compliance certifications and active product status.

Q: Are there compliance differences between the main part and substitutes?

A: Yes. The 0255002.M is RoHS non-compliant, while both substitutes (0251002.MRT1L and 0251002.MXL) are ROHS3 compliant. The substitutes also carry expanded regulatory approvals (CCC, CSA, cURus, PSE, TUV) compared to the main part (CSA, UL).

Q: Which substitute should be selected for automated assembly?

A: The 0251002.MRT1L in Cut Tape (CT) packaging is designed for automated pick-and-place assembly processes. The 0251002.MXL in Bulk packaging is suitable for manual assembly or alternative handling methods.

Q: Are the electrical performance characteristics identical?

A: Yes. Both substitutes maintain identical melting I²t (0.405), DC cold resistance (0.0473 Ohms), current rating (2A), voltage ratings (125VAC/125VDC), response time (Fast Blow), and breaking capacity (50A AC, 300A DC).